I wish I had a better answer for you, but unfortunately it sounds like your unit needs service. If it's happening on all inputs, it may suggest an issue with either the hardware or the panel itself.
I'd definitely recommend a service call for your unit.
I am having issues with a fine horizontal black line about 1/4" in from the top and bottom plus vertically on both sides of the screen. It appears on all settings: 16:9,wide fit and 4:3. Very visible on white screen. It is not part of the standard black bars because the black lines are in in the picture field. You can see the t.v. picture above the fine black lines. I used the reset feature and this was of no help.